How do countries that identify in their constitution as secular treat religion?

Map reflects constitutions in place as of May 2017.

Special relationship with specific religion means that the constitution explicitly states it is secular, but establishes a special relationship with one specific religion. Types of special relationships include referencing a traditional religion, acknowledging the historical influence of a specific religion, or stating that the state is founded upon values or principles from a single religious tradition

Privileges religion over nonbelief means that the constitution explicitly states it is secular, but includes provisions to support religious practice over non-belief, such as granting tax exemptions to religious organizations, allowing religion in public schools, or recognizing or partnering with religious organizations in certain areas.

God included in oath of office means that the constitution explicitly states it is secular, but has certain officials swear before God in the official oath of office included in the constitution. The constitution does not provide for a further role for religion.

References God in preamble means that the constitution explicitly states it is secular, but references or thanks God in the preamble of the constitution. The constitution does not provide for a further role for religion.

No role for religion means that the constitution explicitly states it is secular and provides no role for religion. The constitution may explicitly place limitations on the role of religion.